
/* @(#)w_hypot.c 5.1 93/09/24 */
/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

/*
FUNCTION
    <<hypot>>, <<hypotf>>---distance from origin
INDEX
    hypot
INDEX
    hypotf

ANSI_SYNOPSIS
    #include <math.h>
    double hypot(double <[x]>, double <[y]>);
    float hypotf(float <[x]>, float <[y]>);

TRAD_SYNOPSIS
    double hypot(<[x]>, <[y]>)
    double <[x]>, <[y]>;

    float hypotf(<[x]>, <[y]>)
    float <[x]>, <[y]>;

DESCRIPTION
    <<hypot>> calculates the Euclidean distance
    @tex
    $\sqrt{x^2+y^2}$
    @end tex
    @ifnottex
    <<sqrt(<[x]>*<[x]> + <[y]>*<[y]>)>>
    @end ifnottex
    between the origin (0,0) and a point represented by the
    Cartesian coordinates (<[x]>,<[y]>).  <<hypotf>> differs only
    in the type of its arguments and result.

RETURNS
    Normally, the distance value is returned.  On overflow,
    <<hypot>> returns <<HUGE_VAL>> and sets <<errno>> to
    <<ERANGE>>.

    You can change the error treatment with <<matherr>>.

PORTABILITY
    <<hypot>> and <<hypotf>> are not ANSI C.  */

/*
 * wrapper hypot(x,y)
 */

#include "fdlibm.h"
#include <errno.h>

#ifndef _DOUBLE_IS_32BITS

#ifdef __STDC__
    double hypot(double x, double y)/* wrapper hypot */
#else
    double hypot(x,y)       /* wrapper hypot */
    double x,y;
#endif
{
#ifdef _IEEE_LIBM
    return __ieee754_hypot(x,y);
#else
    double z;
    struct exception exc;
    z = __ieee754_hypot(x,y);
    if(_LIB_VERSION == _IEEE_) return z;
    if((!finite(z))&&finite(x)&&finite(y)) {
        /* hypot(finite,finite) overflow */
#ifndef HUGE_VAL
#define HUGE_VAL inf
        double inf = 0.0;

        SET_HIGH_WORD(inf,0x7ff00000);  /* set inf to infinite */
#endif
        exc.type = OVERFLOW;
        exc.name = "hypot";
        exc.err = 0;
        exc.arg1 = x;
        exc.arg2 = y;
        if (_LIB_VERSION == _SVID_)
           exc.retval = HUGE;
        else
           exc.retval = HUGE_VAL;
        if (_LIB_VERSION == _POSIX_)
           Djy_SaveLastError(ERANGE);
        else if (!matherr(&exc)) {
            Djy_SaveLastError(ERANGE);
        }
        if (exc.err != 0)
           Djy_SaveLastError(exc.err);
            return exc.retval;
    } else
        return z;
#endif
}

#endif /* defined(_DOUBLE_IS_32BITS) */
